diff --git a/fhem/www/pgm2/alarm.js b/fhem/www/pgm2/alarm.js
index d5d4c5087..e97ba91d5 100644
--- a/fhem/www/pgm2/alarm.js
+++ b/fhem/www/pgm2/alarm.js
@@ -52,6 +52,7 @@ function alarm_setAttribute(name, attr, val) {//set Alarm Attribute
 	var location = document.location.pathname;
     if (location.substr(location.length-1,1) == '/') {location = location.substr(0,location.length-1);}
 	var url = document.location.protocol+"//"+document.location.host+location;
+	attr = attr.replace('+', '%2B');
 	FW_cmd(url+'?XHR=1&cmd.'+name+'=attr '+name+' '+attr+' '+val);
 }
 
@@ -127,6 +128,7 @@ function alarm_set(name){
         val += "|"+sarr[k].children[2].children[0].value;
         val += "|"+sarr[k].children[2].children[1].value;
         val += "|"+sarr[k].children[3].children[0].options[sarr[k].children[3].children[0].selectedIndex].value;
+        val = val.replace('+', '%2B');
         FW_cmd(url+'?XHR=1&cmd.'+nam+'=attr '+nam+' alarmSettings ' + val);
     }
     
@@ -144,6 +146,7 @@ function alarm_set(name){
         val += "|"+aarr[k].children[2].children[0].value;
         val += "|"+aarr[k].children[2].children[1].value;
         val += "|"+aarr[k].children[3].children[0].value;
+        val = val.replace('+', '%2B');
         FW_cmd(url+'?XHR=1&cmd.'+nam+'=attr '+nam+' alarmSettings ' + val);
     }